Self-Discharging and Corrosion Problems in Vanadium Redox Flow Battery

D. Hendriana, Mochamad Hamdan Aziz, Yohanes Acep Nanang Kardana, Muhamad Lutfi Rachmat, G. Baskoro, Henry Nasution
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Abstract

Vanadium redox flow battery (VRFB) has a potential for large energy storage system due to its independence of energy capacity and power generation. VRFB is known to have challenges of high price, corrosion problem and lower energy efficiency. In this work, VRFB prototype with all components from existing parts sold in the market has been assembled and tested. Estimated electrochemical reactions are discussed for initial charging process with Vanadium Pentoxide powder as initial state to obtain fully charged battery state with V2+ ion in anolyte and VO2 + ion in catholyte. Material corrosion testes were done by immersing the material in a Vanadium electrolyte and by using the material as a bipolar plate in the VRFB system. Immersion test showed that copper, steel, lead and zinc were corroded badly. In bipolar plate material test, stainless steel 316, aluminum and silver plates were corroded after some hours of electric charging process. Simple carbon plastic composites and 3-mm thickness graphite plates were tested in the bipolar plate material test and failed due to corrosion problem as well. In the VRFB prototype, corrosion problems occurred on brass nipples, polyurethane plastic pipes and porous silicone seals. Stronger plastic components and better quality of silicone seals are needed for VRFB. Significant finding of this study is possible spontaneous chemical reaction within anolyte tank as a potential of self-discharging reaction which other researchers have not identified. Also, another finding from this study is that good bipolar plate for VRFB is not easily available in the market.
钒液流电池的自放电与腐蚀问题
钒氧化还原液流电池(VRFB)具有能量容量和发电的独立性,在大型储能系统中具有很大的应用潜力。VRFB存在价格高、腐蚀问题和能源效率低等问题。在这项工作中,VRFB原型机的所有部件都来自于市场上销售的现有部件,并进行了组装和测试。讨论了以五氧化二钒粉末为初始状态的初始充电过程中电化学反应的估计,以获得阳极液中有V2+离子,阴极液中有VO2 +离子的完全充电电池状态。通过将材料浸泡在钒电解液中并将材料用作VRFB系统中的双极板来进行材料腐蚀测试。浸渍试验表明,铜、钢、铅、锌腐蚀严重。在双极板材料试验中,316不锈钢板、铝板和银板在经过几个小时的充电过程后出现腐蚀。简单碳塑复合材料和3mm厚石墨板在双极板材料试验中也因腐蚀问题失败。在VRFB原型中,腐蚀问题发生在黄铜接头、聚氨酯塑料管和多孔硅胶密封件上。VRFB需要更坚固的塑料部件和更好质量的硅胶密封件。本研究的重要发现是在阳极液罐中可能发生自发化学反应,这是其他研究人员尚未发现的自放电反应的潜力。此外,本研究的另一个发现是,用于VRFB的良好双极板在市场上并不容易获得。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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